Question

Carbon and oxygen combine in the ratio of 3:8 by mass to form carbon dioxide. What mass of oxygen gas would be required to react with 15g of carbon?​

Answer 1

It is given that,

C + O2 ---> CO2

in carbon dioxide, the ratio of mass of carbon to oxygen is 3 : 8.  

Let x grams be the mass of the oxygen that would be required to react completely with 6 grams of carbon. According to the law of constant proportion,

(6/x) = (3/8)

=> x = 16 g

Therefore, 16g of oxygen is required to completely react with 6 gram of carbon.

Answer 2

40g of oxygen is required to completely react with 15 gram of carbon.

Explanation:

• It is given that, C + O2 ---> CO2in carbon dioxide, the proportion of mass of carbon to oxygen is 3 : 8.
• Let x grams be the mass of the oxygen that would be required to respond totally with 6 grams of carbon.
• Concurring to the law of steady proportion,(15/x) = (3/8) => x = 40 g. Hence, 40g of oxygen is required to totally respond with 15 gram of carbon.